Table 3

Estimated differences in observed and predicted rates and counts of intensive care admissions, 2007–2010
Influenza season
2007 (15 weeks) 2008 (16 weeks) 2009 (19 weeks) 2010 (12 weeks)
Rate difference per 100,000 (95% CI) Count difference (95% CI) Rate difference per 100,000 (95% CI) Count difference (95% CI) Rate difference per 100,000 (95% CI) Count difference (95% CI) Rate difference per 100,000 (95% CI) Count difference (95% CI)
ARDS −0.05 (−0.19 to 0.10) −3 (−13 to 7) −0.08 (−0.22 to 0.068) −5 (−15 to 5) 0.47 (0.29 to 0.65) 34 (21 to 46) −0.02 (−0.15 to 0.12) −1 (−11 to 9)
Respiratory failure 0.60 (0.068 to 0.94) 35 (5 to 65) 0.55 (0.12 to 0.96) 38 (8 to 68) −0.21 (−0.74 to 0.32) −15 (−53 to 23) −0.27 (−0.68 to 0.13) −20 (−49 to 9)
Mechanical ventilation 1.45 (0.75 to 2.14) 100 (52 to 148) 0.45 (−0.22 to 1.13) 32 (−15 to 79) 0.27 (−0.57 to 1.11) 19 (−41 to 79) −0.069 (−0.71 to 0.57) −5 (−51 to 41)
ECMO* −0.05 (−0.06 to −0.03) −3 (−4 to −2) 0.01 (−0.01 to 0.03) 0 (−1 to 2) 0.30 (0.28 to 0.32) 21 (20 to 23) 0.05 (0.03 to 0.06) 3 (2 to 4)

ARDS=Acute respiratory distress syndrome; ECMO=Extracorporeal membrane oxygenation.

*Because of small numbers of influenza diagnoses outside of influenza seasons, predicted values were based on a constant mean value outside of the influenza seasons. All other predicted values were based on the seasonally oscillating predicted values from the time series model.

Schaffer et al.

Schaffer et al. BMC Public Health 2012 12:869   doi:10.1186/1471-2458-12-869

Open Data